Marine propeller.



D. UROH.

MARINE PROPELLER.

APPLICATION IILED OCT. 10, 1908.

2 SHEETS-SHEET 1.

anuanlroz Patented Dec. 14, 1909.

aikwnugo D. URCH.

MARINE PROPELLER. APPLIOATION rum) OCT. 10, 1908.

942,986. Y Patented Dec.14,1909.

2 SHEETS-SHEET 2.

DAVID 'IZJIEt(.7I[I, 0F PORTSMdUTH, NEW HAMiSHIRE.

MARINE PBOPELLER.

Specification of Letters Patent.

Patented Dec. 14. 1909.

Application filed October 10, 1908. Serial No. 457,147.

To all whom it may concern:

Be it known that I, DAVID URoH, a citizen of the United States, residing at Portsmouth, in the county of Rockingham and State of New Hampshire, have invented certain new and useful Improvements in Marine Propellers and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to marine .pro pellers, and has for an object to provide a propeller adapted to be secured to a craft of any style, but especially to small craft, and embodying improved facilities for con veykin power to the propeller. provide a torpedo-shaped casing with means forxsuspending such casing beneath the craft and with means for transmitting power frtiim 'the craft to the propeller of the torpe 0.

With these and other objects in view the invention comprises certain novel constructions, combinations and arrangements of parts, as will be'hereinafter fully described and claimed.

In the drawings :Figure 1 is a view of a conventional craft in side elevation with the improved propeller carried thereby. Fig. 2 is a top plan view 'of a conventional craft showing in dotted lines the position of the propeller beneath such craft. Fig. 3 is a view in side elevation of the propeller and propeller supporting means with portions broken away to show the inner construction. Fig. 4 is a transverse, sectional view of the suspending means taken on line 14 of Fi 3.

like characters of reference designate corresponding parts throughout the several views.

The improved propeller forming the subject-matter of this application is adapted to be associated with practically any style and form of water craft and is here shown as associated with a conventional craft of the catamaran type. As shown the craft comprises the usual spaced hulls v10 su porting a body 11 within which a motor 0 some form is mounted shown at 12 as a conventional explosive engine. ile other features of a craft are shown it is to be understood that such are shown only to illustrate At, its lower end the casing urther object of the invention is to an operative structure and form no essential part of the present invention.

At any convenient and desirable place upon the bodyof the craft a yoke cured having bearings as 14 for the shaft 15 of the engine. To the under side of the yoke 13 a casing 16 is suspended extending downwardly through the bottom 17 of the body of the craft and preferably substantially diamond-shaped or elliptical in transverse section. As shown the casing 16 comprises side plates bulged at their centers and with their edges drawn together and secured in any approved manner as by the rivets 17. 16 supports a cylinder 18 by being secured thereto in any approved manner, such cylinder forming the center of the propeller torpedo, the forward end of such torpedo being a cone 19 either solid or hollow, and the aft end being a truncated cone 20, which must be hollow to a certain extent to receive the propeller shaft 21, carrying the propeller blades 22. Gentrally within the casing 16 a pipe 23 is erected communicating at its lower end with the cylinder 18 and at its upper end with an oil receptacle '24 havin means shownconventionally at 25 for Introducing oil therein.

The engine shaft 15 carries within the casing 24 a'beveled gear 26 intergeared with a beveled gear 2'1 which said beveled gear 27 is carried upon the upper extremity-of a shaft 28 operating within and slightly smaller than the interior vdiameter.of'the pipe 23. At its lower end "the shaft 28 is provided with a beveledgear 29 intergearing withjla' similar beveled gear 30 carried upon the propeller shaft .21. It will thus be seen that rotary movement from the engine shaft. 15 is transmitted through the.

gears 26 and 27 to the shaft 28 and through the gears 29 and 30 to the propeller shaft 21, all of such arts rotating within a space in communication with the oil receptacle 24 so that the entire mechanism from the engine shaft to and including the propeller shaft rotates in oil. The aft end of the cone 20 is also provided with a stufiing box 31 supplied with oil from the hollow portion of the cone 20 in communication through the cylinder 19 and pipe 23 with the oil rece tacle 24 t will be apparent that the interior of the casing 16is not in communication with the 13isse-- oil receptacle and advantage is taken of this k fact to furnish water forcooling the engine or other desired urposes. To carryout this purpose a plurality ofholes are provided in the fore side of the casing l6 vbelow the water line which is showndiagr'am- Within the casing -a 1pe matically at 33.

34 is disposed having its lower end below the water line 33 ad acent the openings 32" and communicating by the necessary elbows and otherwise'with the body of the craftso that water may be drawn from the interior I of the casing 16 through such-pipe '34:

. the bottom 0 obvious. that craft of different mitted to the casing 16- and to the pipe 34:.

It will be seen th t in; the craft of the catamaran ty e. as shown in Figs; '1 and 2 the body is suspended, some distance above'the water line so that the casin 16 is of considerable length between such be and the water line. Itis, of course, builds will I necesjsitate casings of f different length and Qdiiferent manner jcr'aft. i' r y 39 'ill'be 'notedgtfi t-thesnormal level of in the oil reserve of securing the same to the the oil carried for atingpurposes' with v 'atfa considerable height above the wa rlev'elwhereby a pressure is maintained "without the use of .7 any mechanicalappl1ances-3upon (the lubricant v within the torped mer ed ball,or'-* r ller" bearings are made possible. ithout the danger of water leakage pressure without; I I

The employment of the propeller of the class shown also renders it possible for the marine constructor to carry the greatest beam ofhis craft "for thenecessary support of his motive power as far aft thus making it poss'ble to construct on finer lines and secure an increased 5 eed with the prcrpellers nevertheless proper y submerged.

- hat I claim is 1+- 1. In a marine ropeller, a craft body, a casing suspended eneath the body, a proepeller casing carried by the suspended casyoke carried by the body,

be screened in any ord1- and below the water line,

' ter compartment 1 By this-means subcasin owing to the factgthat'the pressure of the 'oil within the casing is greater than-the as he desires,

ing, transmitting and propelling mechanism journaled within the casings, means embracing the moving parts adapted ito maintain a lubricant in contact therewith and to divide the suspended casing, and means to conduct water fr 111 within the suspended casing. "2. n a; propeller, a craft body, a casing sus ended 'beneathxthe craft body, a proer" casing carried 'by the craft body, means separating the suspended easing into oil and water compartments, and mean's to conduct water from the casing. 3. In a marine propeller, a craft body, a a casing carried beneath the body a torpedo-shaped casing carried at the lower extremity of the suspended casing, meansjdividing the I, suspended ments, power transmitting mechanism ourby the yoke and extending naledvwithin the oil compartment, a pro- 'peller carried by the torpedo-shaped caslng,

-mean's connecting the transmitting mechancasing into oil and water compart- 1 ism with the propeller, mea ns to drive the transmitting mechanism, and a water, pipe extending from the craft body into, the waof the casing.

4. In a marine propeller, a propeller casing, a propeller shaft journaled within and extend1ng with0ut the casing", a shaft extending wlthinthe propeller casingand inter geared with the propeller 'sha a casing embracing the last mentioned shaftand communicating with the ropeller casing, and a casing surrounding t e last mentioned casing and 'not'in communication with such or the propeller casing. ,5; na marine propeller, a propellercasing, a propeller shaft journaled within and extendingwithout the casing, a casing communicating transmission shaft rotating within the last mentioned casing, a casing surrounding the last mentioned casing and rovided with perforations, and means to wlthdraw a fluid .from' the-last mentioned casing.

- In testimony whereof I afiix my signature in presence 0- two witnesses.

' DAVID URCH.

Witnesses *EDWARD H. ADAMS, v ALICE M. CRAIG.

with the I propeller casing, a 

